winkler



C. WINKLER.

PRINTING MACHINE HAVING OSCILLATING PRmHNG CYLINDERS,

APPLICATION FILED OCT. 11 1915.

Patented Oct. 21, 1919.

4 SHCETS-SHEET1 APPLICATION FILED OCT. 1, m5.

Patented Oct. 21, 1919.

4 SHEETS4HEET 2.

THE IZOLUMLHA PLANOGRAPH ($0.. \vA-snma'rox, n. C

C. WINI LER.

PRINTING MACHINE HAVING OSCILLATING PRINTING CYLINDERS. APPLICATION FILED 0011,1915. 1,319,198. Patented Oct. 21,1919.

4 SHEETS-SHEET 3.

APVUF/YEVJ C. WiNKLER:

PRIN'HNG MACHINE HAViNG OSCZLLATING PRINTING CYLiNDERS.

APPLICATION man oer. 1. was.

L319J98. Patented 001;. 21,1919.

4- SHEETS-SHEET 4.

CARL WINKLEB, 0F BEBNE, SWITZERLAND.

PRINTING-MACHINE HAVING OSCILLATING PRINTING-CYLINDERS.

Specification of Letters Patent.

Patented Oct. 21, 1919.

Application filed October 1, 1915. Serial No. 53,664.

To all whom it may concern:

Be it known that I, CARL WINKLER, a citizen of the Swiss Republic, residing at Berne, in the Swiss Republic, have invented new and useful Improvements in Printing- Machines Having Oscillating Printing-CyL inders, of which the following is a specificat-ion.

My present invention relates to improvements in printing machines in which the impression cylinder is oscillated backward and forward over a reciprocating carriage carrying the form. Printing machines of this kind are so improved by my present invention that an eXact register is rendered possible in placing the sheets into the machine, further, smearing of the freshly printed sheets is avoided, and a reliable conveyance of the sheets is assured.

In the drawing a printing machine constructed according to the invention is shown by way of example,

Figure 1 being a side elevation showing the principal partsof said machine.

Fig. 2 is a diagram representing the impression cylinder and type carriage in the position in which the grippers have just taken hold of a sheet.

Fig. 3 represents the impression cylinder in section on a larger scale in order to better show the mechanism for operating the grippers.

Figs. 4, 5 and 6 are sections through the impression cylinder showing a special construction of the gripper mechanism in three different positions.

Figs. 7, 8 and 9 show the impression cylinder in different positions in regard to the mechanism for leading the printed sheets out of the machine.

Figs. 10, 11 and 12 are sections of the im pression cylinder representing the belts for guiding the sheets in three different positions.

In Fig. 1 the crank pin a is at a dead point. As a consequence the carriage b, which is driven by the toothed wheel a at the end of the connecting rod a engaging I in the toothed racks Z), 5 is at the end of its stroke and the impression cylinder 0 is about to change its direction of rotation. The gripping edge of the cylinder is then underneath the feed table 6, the grippers f are opened by the lever g and project over the edge of the table 6 and sheet it placed on said table. As soon as the cylinder 0 begins to rotate in the opposite direction represents ed in Figs. 1 and 2 by an arrow the grippers f close gradually, and they are completely closed when the impression cylinder arrives in the'position shown in Fig. 2, so that the sheet is pulled off the table 0 and is wound on the cylinder 0. It will be clear from Fig. 2 that the angular velocity of the cylinder 0 at the moment in which the grippers f close and take up a sheet is very low, because the crank pin a has only advanced through one twelfth of its stroke. According as the crank pin moves in the direction of the arrow the angular velocity of the impression cylinder will naturally increase, and it is greatest at the point in which the connecting rod and crank arm are at an angle of 90. In Fig. 3 the gripper mechanism is shown on a larger scale. This mechanism operates as follows:

The sheet to be printed is placed on the feed table 0 against the stops z. The

tongues m attached to the edge of the feed table 6 extend down to the stops i, so that the sheet h is well supported and can be placed accurately against the stops. The impression cylinder, which is rotating backward at the time, comes to rest or changes its direction of rotation when its edge d is underneath the edge m of the feed table 6. During the backward rotation of the cylinder the roll 70 carried by an arm fixed on the shaft carrying the grippers f, runs over the block 9' on the lever g, so that the grippers f are opened and come to rest over the sheet It. When now the cylinder begins to turn forward the lever g is caused to move toward the axis 0 of the cylinder 0, so that the grippers f close slowly and take hold of the sheet it. As soon as the grippers are closed the stops 5 rise and the sheet can then pass underneath same.

By the described construction a uniformly good application of the sheets to the cylinder 0 is assured. Similar machines have the drawback that owing to the weight of the type carriage and impression cylinder a certain amount of play is caused to be formed in the separate parts, so that the change in the direction of motion of the cylinder takes place unevenly and consequently an exact register cannot be obtained. This unevenness is quite particularly noticeable when the impression is carried out at different speeds. As will be clear from the above e planation these drawbacks are overcome by the sheets not being taken up by the impression cylinder at the point of change in the direction of motion of the impression cylinder, but always after the forward motion of the cylinder has just begun and said cyl inder has therefore still but a low speed.

In the construction of the gripper mech anism shown in Figs. 4t to '6 the points of the grippers move backward over the edge of the sheet h in such a manner that they together with their axisform an acute angle with the sheet. Fig. 4 shows the 1mpression cylinder 0 approaching the end of its backward stroke. The lever g is so moved by the crank shaft that the roll f at the end of the lever f is raised by the block g. Consequently the grippers f are opened against the tension of the springs f so that they can then move backward over the edge of the sheet h placed on the feed table 6. Fig. 5 shows the impression cylinder after it has approached somewhat farther toward the end of its backward-stroke. The grippers f, owing to the motion of the lever then begin to close under the tension of the spring In the position shown in Fig. 6 the impression cylinder 0 has moved up to the end of its backward stroke and has turned forward to such an extent that the grippers have just closed. Immediately before closing the points of the grippers slide on the edge of the sheet and thus stretch and smooth the sheet h.

The device for delivering the printed sheets out of the machine shown in Figs. 7 to 9 has the object to so utilize the return motion of the impression cylinder that the sheets are carried out with. the printed surface uppermost. Fig. 7 shows the position of the cylinder after the sheet has been printed. In this position the cylinder 0 is raised from the carriage Z), in order to prevent the printed sheet from coming into contact with the form. During the return motion of the cylinder 0 the grippers f remain closed and the sheet is held fast on the cylinder 0 by the belts h, the back edge 01 theshcet being thus led over the tongues 91. which previously had been raised in the position shown in Fig. 7 to allow the sheet to pass to print, but in the position illustrated in Fig. 8 they press against the cylinder c and thus lift the sheet and lead it toward the delivery device a. In the posi tion of the parts shown in Fig. 9 the cylinder 0 has rotated back to its full extent and begins to change its direction of rotation. A sheet has been delivered to the device a and the grippers f are opened again for taking up a new sheet placed on the feed table 6.

The delivery device is driven by a spurwheel 0 attached to the impression cylinder 0, and in the driving gear a n a so-called free wheel a is provided, in order to cause the belts n, to be driven in one direction only by the reciprocating cylinder 0 and at a speed corresponding to that of said cylinder. The tongues n are raised and lowered by the lever a and rod a which latter is operated from the main shaft of the machine.

The device for guiding the sheet is shown in Figs. 10 to 12 in different positions. Said device consists of belts h, which are connected at one end to the impression cylinder at c and at the other end to rolls 0 which have the tendency to wind up like the tape of a spring measure, so that the belts h are always kept in a stretched condition. Fig. 10 shows the impression cylinder 0 to- .gether with a sheet 72, to be printed after the cylinder has described quarter of a revolution, the belts it being unwound from the rolls 0 to a corresponding extent. Fig. 11 shows the printing cylinder 0 after the impression has been effected. The belts h surround the impression cylinder 0 and overlap up to the point 0 at which they are 1 fastened and hold the sheet fast. According to Fig. 12 the impression cylinder 0 has rotated backward sufficiently to deliver the sheet to the conveying out device, the belts h being again wound up on the rolls '0,- so that the printed sheet is free. This sheet is leaving the impression cylinder and a new sheet is taken up by the grippers 7.

As shown in Figs. 1, 7 and 9 the impression cylinder is raised when rotated backward, so that it does not come into contact with the carriage. For the purpose of raising the impression cylinder the follow ing device is used The axis 0 of the impression cylinder 0 is jonrnaled in the sleeve 0 in the side frame 0 of the machine. The sleeve 0 is connected with the shaft '0 by means of the levers p, p and connecting rod q. Said shaft 0 is moved in accordance with the reciprocating movement of the carriage by means of the lever p rod 9, lever r, and eccentric s, so that the impression cylinder is raised at the proper moment.

What I claim and desire to secure by Letters Patent of the United States is 1. The described printing machine, comprising in combination, as oscillating cylin der, a carriage adapted to reciprocate backward and forward in proximity to said oscillating cylinder, a feed table to carry the sheets to be fed to said cylinder, stops for the front edge of the sheet placed on said feed table, gripping devices attached to said cylinder at such a point that during the backward oscillation of said cylinder they will pass well behind said stops and of such a shape that a line connecting their points with their axis of rotation forms an acute angle with said feed table when said cylinder begins its forward oscillation, and mechanism to close said gripping devices during the forward oscillation of said cylinder after the play in the driving gear of said cylinder has been taken up and said cylinder is already well in its forward oscillation and the gripping devices have exerted a smoothing out action on the edge of the sheet placed on said feed table, substantially as set forth.

2. In a printing machine, the combination of an oscillating cylinder, a carriage adapted to reciprocate in proximity to the cylinder, sheet gripping devices carried by the cylinder, and means for operating the gripping devices so that they will be moved into engagement with the sheet without gripping the same just before the cylinder reaches its rearward stroke and moved into gripping engagement with said sheets after the cylinder has commenced its forward stroke, where by the sheets will be stretched and smooth ened and exact register of the sheets obtained.

3. In a printing machine the combination with an oscillating sheet carrying cylinder, of belts attached to said oscillating cylinder at one end and to automatic spring winding rolls at the opposite endsyadapted to keep said belts stretched in all angular positions of said cylinder, substantially as, and for the purpose set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

CARL WINKLER.

Witnesses ROBERT BALsIenR, M. BERTSGHINGER.

copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents, Washington, D. 0. 

